During 2008, Burks Corporation spent $510,000 in research and development costs. As a result, a new product called the New Age Piano was patented. The patent was obtained on October 1, 2010, and had a legal life of 20 years and a useful life of 10 years. Legal costs of $54,000 related to the patent were incurred as of October 1, 2010. On June 1, 2012, Burks spent $28,440 to successfully prosecute a patent infringement. As a result, the estimate of useful life was extended to 12 years from June 1, 2010. In 2014, Burks determined that a competitor's product would make the New Age Piano obsolete and the patent worthless by December 31, 2015. Prepare a workpaper that tracks the asset balance and annual expenses associated with R&D and the patent from 2008 through 2015.